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John Curtis

Lipohaemarthrosis

Lipohaemarthrosis occurs when there is an intra-articular fracture and is most commonly seen in the knee joint due to the very specific fat-blood meniscus level sign which occurs on the horizontal beam lateral radiograph.

The presence of a lipohaemarthrosis may be the only sign of an occult intra-articular fracture and is therefore an important observation to make as a radiologist. Don't forget to always suggest orthopaedic review or further imaging when you see this finding.

This video covers the X-ray and CT appearances.